 |
Home \ Products \ Limit Switches Electronic Module of Electric Actuators (LSEM)
 |
The LSEM is designed to equip types A, Á, Â, Ã, Ä multi-turn electric actuators, serially produced by the TULAELECTROPRIVOD (ÒÓ 26-07-015-89), instead of the traditionally used mechanic limit switches module (LSM) and also for multi-turn electric actuators ÝÏ4 (EP4) series and part-turn electric actuator 2MÏÊÝ-4000-C-70.
The LSEM provides with easily realized accurate adjusting of the electric actuator and its control automatisation. It does not have any drawbacks caused by using microswitches and a lever-cam mechanism in the LSM.
The outfit of the electric actuators can be conducted either during their production or as the modernization of the electric actuators, equipped with the LSM, already used by the customer, by changing the mechanical module of the LSM in the limit and torque switches for the LSEM module, the modification of the electric actuator body is not required. The changeover can be performed right at the customer's.
Electric actuators are equipped with the LSEM in general-purpose and explosion-proof versions.
The LSEM setting is carried out by means of the remote control through the IR communication channel.
The LSEM is powered from alternate current circuit (220V, 50Hz).
The LSEM allows the realization of the following functions:
- the adjustment of limit and torque switches without opening an electric actuator, the adjustment being done by remote control through an infra-red communication channel at the distance up to 0,7 m. One remote control can be used to control several electric actuators;
- four limit switches respond (electromechanical relays) when reaching the pre-set positions of the output shaft (two limit and two intermediate switches);
- two torque switches (electromechanical relay) switching on when reaching the maximum torque value of closing and opening, the adjustment of extreme torque values is done within 40% to 100% from the maximum electric actuator torque;
- visual observation of the present position of the pipeline valve on the LSEM digital light indicator in the percentage of its full motion, as well as the electric actuator shaft rotation and its direction, «opened» and «closed» positions of the valve stop device, limit switches switching, visual observation at that is done both from the mains power point and from the additional LSEM power point. The additional power point is set by the user (4 chemical current sources, type R6 or LR6, with 1.5V voltage);
- transmission of the information about the position of the pipeline valve with the help of a unified current signal 4–20Ma;
- transmission of the information about the position of the pipeline valve and the switches by means of a digital communication channel (RS-485 interface, MODBUS record) for general-purpose electric actuators, the list of the transmitted information is specified in the order. Digital connection channel is realized only in general-purpose electric actuators;
- torque switches blockage at the pipeline valve 10% derangement of full motion from the extreme positions (can vary from 0 to 100% according to the customer's wish);
- signaling the electric motor switching off when the electric actuator shaft does not rotate after exceeding the preset time;
- power self-sufficient control over the limit indicator and giving the information about the present moment position of the pipeline valve;
- giving the integrated information about emergency cases;
- registration of the cycles number of the electric actuator;
- communication with the adjustment control panel and commands, and the data translation between the control panel by means of a full-duplex infra-red channel both from the mains power point and the additional power point.
- prevention of condensate water formation within the module by means of the heater;
- protection from unauthorized access to settings changing;
- In case of an emergency de-energizing the LSEM adjustment is not needed.
The LSEM reliability indices:
- average work as far as it will go is not less than 2000 hours (6000 «close», «open», «close» cycles);
- average resource is not less than 6000 hours (18000 «close», «open», «close» cycles);
- average working term is not less than 10 years.
Limit Switches Electronic Module of Electric Actuators (LSEM)
|
 |
